To reach 0.5c, a 2-gram light sail must receive about 7x10^13 J (19 GWh) of laser light, and Einstein's 1905 moving-mirror formula is only the infinite-mass or infinitesimal-energy limit of the exact recoil formula.
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Energy needed to propel a tiny spacecraft to Proxima Centauri,and, an unstated assumption in Einstein's 1905 paper
To reach 0.5c, a 2-gram light sail must receive about 7x10^13 J (19 GWh) of laser light, and Einstein's 1905 moving-mirror formula is only the infinite-mass or infinitesimal-energy limit of the exact recoil formula.